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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7544d1fe7161b4ff43fb6f4f0c0407cca74885d30ec5e07afe68e6b40cfe121' 
  AND token = 'WdJ6+Ju5/6Ur1OHX5cQn/JaY1joC3WY5e8BzXJ/0CPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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