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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f46631f4f5e6749797a3c1f8457c8a5e9ca4c2b50ec6023558a9bf01c2cc1286' 
  AND token = '5T8+rwx2wMDxBJRueVCBEnWZ4BG8y0R6aeagzAx1v7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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