SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8fb250ab5bab28213c05e898f6f8561781245b65c70640e7a4559e71c47e1daa' 
  AND token = 'g11tpZfWSH/zcFsPsj14VSuBEhxyDKfKG5jB1nUi9Ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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