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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a478329084c263673ea4fa0afb9fe67e46cec9b75cd8eac03b3a8aff99e55c79' 
  AND token = 'eukrTKyHSq46D6mXHV+T12KWk6Dh0tAxAtPLg+xvjvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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