Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e9636816ce7e3af3133b7d4cae07eeb4dc36b226ee3d5cd57b7df667ea98aac1' 
  AND token = 'EVbGDDe1JdtlCsN1kDBLzYnj+MaSBkD107Fm1Rbiq5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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