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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f9fd285a29924cb54ccc2a2824d8ef02c5e173dcabcc621b34a4b7a8c5f2483' 
  AND token = '+JV5J329MRMh7beBTG9NOZUk+pkWWCMzdFtrRnavj4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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