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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f8f05dfed26f219d0dff4eb890e5883fe875ac482359ba141a1bf80b8bcc99d2' 
  AND token = 'M3wI+mJptIflumj5gs6im93us6ynu7lCybUcK5f4r6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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