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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f56e313dad909550833ab71af211acfd79bbc4106f433bfe62409fce19c6cbf9' 
  AND token = 'MKaLOp6uLGqQLutkvx9xF5ZiJM6d8TXCeXYsKOXt+J4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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