Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd900f05a093c3b45cc2db2f9f05dfa84f86432c2aadfc08d9cbd1dc77b59dc39' 
  AND token = 'YMiAiUkOpl0aKYkPYSz9qDs2yFuOEJ9SHJ40OGVmdYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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