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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '033c6e2e379318a9990c84d58df28ad5222af70367d346c402f8cc446cf964b6' 
  AND token = 'rg+1ukdVDB2eallWDvZ6+CXlj9VM8ipSdQNPmBf7M6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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