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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e94cda2e5e7888b557cac98358ed4504b25daa0284c606ac51fa7f1f16c33de3' 
  AND token = 'nrjq/zylUAsxY0I7rH6ULEALm8kxL0DRrQauKEw3ngU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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