SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce9ce1f2e38a96c06861d7db581e7872b461cd3655a589cfcb9477b9fc3b4140' 
  AND token = 'TROXIQIaXmJS8h/HlWMybZS65Sg2/JhRGeZy6q18XQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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