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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a365c8fd91fd7a9b2fbbb7f84579926b7a550504bc8929104a3e48d45599eb04' 
  AND token = '98bXtD2WSevR8YlWsYuhJdZuYVhuaIdvkD2e7lbtCdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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