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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c3048a76fab957687f2a52ee42052ef15cc7d41979ef9c6e16987ae8b7a895a' 
  AND token = 'pfzyLwM855molmOmNNmWsV8E5ASvIkf4JTQ3YOc2Cz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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