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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '677539089f0074db9f2feb458100177d8003d746f4168ebc5916d207ddece89c' 
  AND token = 'mSFNKpW6SpfoA9JlPyXTfHN4Jzm3B3NEIZeq3A1//4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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