SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f555fb97bc8e45840af784760a5907682ea1deba46a26d7b86298ebe8de05d0' 
  AND token = 'ZnApFKnkiLswFH+ScHwejwbfxuvQljskzbgFQVoH/30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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