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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '487692fa351bf6dc3f41fb50f97a3f54d7a3bbc5a4bedfb1a46e8706a94fe7da' 
  AND token = 'WIYuw5d/H7k+JSuyJXLkQR1JJe+NqAS/742DHl2XQ2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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