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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f53956a336cdade25497fc9fd097a2bcc66cc7aa8ae1a9915b4ed7f97d0a19d8' 
  AND token = '8UlO8l4grtYw0b1ogwnDVGI7uXoqAxS1NCXekoj+IHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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