SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0275632643c5363d3b29f3fa463d7fd3bf7e6cd9985cf6f154f099d2637225e4' 
  AND token = 'HTDmWf+aVQMdAR8s0GR+TnBT8FvxotLbyhp2kKmOE8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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