SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5263e5b334dcd4900201c268514dbed9e50bdc6f5cc0ac035fb703f38bf2f7eb' 
  AND token = '27jWwXo/W7h19QUHzv4vxl1UPuIuBElzuRnwd2YgwWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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