SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e0ecad3a72e4d00018ccb9178747f5c7da7f439e845abee7804392ddb891a3d' 
  AND token = 'F6GoAiYhvV2rRLQ5Prhw0qv6hEgTQoZpqLUBnRWuSzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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