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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d306cd98c633405cf1c9821a9b9be1ad9472e0447be2ebc4791d3a3174d7d3d' 
  AND token = 'iqFh/iuz+Qu09Xl5DfIjb33N2MCxoM+NG1+0WqLm5n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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