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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '196ce9df40054c400306394397922e2ceebff966f78af3f50243ed5e8d03b9df' 
  AND token = '0qFLXfiog6kjr3cqnSTXBhMdIGqFhYO2T9oEbGNnWgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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