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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ceff31760ee734e89d675d277b7f4bd9baaebe802e43cda84493a81586da444' 
  AND token = 'AQHLr93l0Jn+x4dc03UjrTMlHMCO0ZrUDgb7/LZ044E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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