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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6dc5c5ed83a07ca0a5c28ea695b6ca1c48aa50e3086881f6107d487468c7b846' 
  AND token = 'ku7pNXKNzuVCk/xJhRb7nLb5OwirdpctAnczmrWah6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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