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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5bbdf42db780c7454580153085c2584c3f83198bb1470a020f82f218ae97c971' 
  AND token = 'sbf9eaTinQqnMOJigTtaf1EUMMJ4wR1wDqrf/6hMBVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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