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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f7a93666c9f0c6ef75fb6bbeb52e5012bbe4ced9919c756197fbc19a3884fd2' 
  AND token = 'UeJoCSxf7ppkgpyZ8Zg+uDIVaYgNavWVukL7E3vKDQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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