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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37cb6cbbb1e73bd78d9a255febf9bb39dd65d23f5c6b611991a602a9bf9a532b' 
  AND token = 'Prf2X7Lq5DZPvFSxxuDBYxY/sbUSQTuMU5COAKn9Rfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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