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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c253962ce725835d313d4e28e4e0720a61c62e8bcc5d9c52041e72f6ac3c9bbe' 
  AND token = 'WjZVRPltdl6dZfQvZl0cqj84PF9u/fXf1criqWLmOvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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