Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd52b63be6edad71b3dfb97128a80aee9fb0496adc048d82693b893a43d02437b' 
  AND token = 'lnYmwkMa/xxH2aYQ7lQaATot35VgB1bOto9kBPFdg5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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