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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3b7342ebdd42422bbd47e92c82341f14fe5c22265f95e3c90c989d4d9670efe' 
  AND token = 'l88+Z++yipFUpsGZNInia7Ih6XusjBGzQ9qXibuu8o8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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