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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa7e97a7acfa587877d431c6ba441171f6581e1b8552360dbf92feba19ac1ac1' 
  AND token = 'me1NLlzxqqWRWKNTxQ1yqNiZ6UrkJwA5pXBNE8zhKCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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