SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eff0bd3642a1c7af427d635f050719d599f0ba7dcfc6322dfb78613d6a34a9b4' 
  AND token = 'JP3WHL8UglVS7GSmGlJe1CWjYCSwvbjW1Z82+uh3gVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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