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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c9be797828bc4fdafc8b01c771c9b993fbf2af1b2b8857a50f13aa774369e0d' 
  AND token = 'gmYkdXGYujAyfLEPfUIPP3ien/c4t2yxABS5AoyWkBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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