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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a85cdd8b1dcdedd621c8148c42cd0fb086032034225ebe347f52e119b2926986' 
  AND token = 'YF0JPDHdUQBUg4f/KRwAiA0fwjXpt3WtOTT0KfwRc0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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