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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'afe68789e482dc11b83ab978a790f656f72d77e3e4128f5d2d69c16eb9356d52' 
  AND token = 'MaDWtQTTF9Gdd2OAtqSQPaabN5D679jmjRxyaVVz6JQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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