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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cabd9c3d550775264cba8e9c83c672ab991180f10811da2c5db1ac48dccb6bca' 
  AND token = 'Ko21Inqxh/A8Y1hdgQyu/SwtpqY8C+MdOpjoXbN3BXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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