SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da83b81b3016ece74e6396238f642275c4935723b9fc6226fcf8af37952dfb96' 
  AND token = '723r1Jh1TkTP8GLROL8qEa4l+JmG0ib9jt/lDqGZh/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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