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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dfac44fd6973be35c8b2c8adce3f18c79b2e10efa2d7a232e7b89864e672eba3' 
  AND token = 'voTR9iqTTJO46S7kjDw+CG7zaIq85/RyWH74I7nkKKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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