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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0caa78e3b6917d566aab420b03e8b8d975c5023e0890f1185ba9eb0c85f962b8' 
  AND token = 'l4wxeroQi94/c22b35ok48stoinH7J/yT870JQLxQ40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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