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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e198f6cefc9e0b5ce399cadeeab96211ea461ce8ea10cbc86201e4b9bb0969f8' 
  AND token = 'P6OSsbigV7t5ZJH4YwpdpmBDhNn+av9t+LsDUh/fSdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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