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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8637de038f941b49316ea456cde72d01b356d24335d4ce5f715792cbece5459' 
  AND token = 'AnjZHn1TMV5WsZy204ce4nGVR4r+GSOatXy8++B8sN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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