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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9498929577d31959d45eeb1e9e17b803506642572eadba3b0f05b66d27dd535' 
  AND token = 'L2srx0IN0FdS3nDtIpU7Gfq4xhf7EKdoN8VPk9XAQLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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