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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6fccf5099716877892e4b92bfc167a3c2c278be179922695e052bdc0ccbc76bb' 
  AND token = 'kf6yw2h75IVM7F4mbWsYLJQOLy0CXtwI0UdS/1Ho0xI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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