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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9eadcc581315db4a86ee5d30190211bfd86a0c79749604ef60515af9b1603642' 
  AND token = 'W6ny6Z0RWNk9N963Nj9E2Mq1SC0kNMRYHQAxF8is+Pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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