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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '72a8fbb8b3bc3c084b49b820b402486ed5b6befcaef0fcabc062e0d606bf5353' 
  AND token = 'NjA7kXZqrO5rCaTaL8kp4zUlapHikLqh3wpbEioC/cM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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