SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd13fd0770194d48dd2c522f23611537bd8aea26e6282583bc2d5ec062a65c4f' 
  AND token = 'gBYJ9UC+DPrBBz9QumZleFYS4/HSwGkf1gN5wEphh+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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