SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '986ef16fa381a9fedf03e38d524335b1cd1219436cce8cc5bf5b098d8139a597' 
  AND token = 'vt3Q9K5/XVqzEhRaix7TBYfAKlCtnTleXeZU2EgvM80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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