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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a93d229f720ba2edbdc6c7ccf9c341d51bd8f4ad063d5fd4b3209fdacbfd77df' 
  AND token = '7KatpJ2J2VMbffYdpNMnVbM2Sg5M7GPaUeomOoZrnMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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