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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e56fbbf349061c86e860b621be431c76815d58e7c4bcd7e8c81aa7100c12573' 
  AND token = '5R1w0GWDIFK3FpZMsEp/x4myCRov4EleGhJRtHFXFcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}