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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4648026f3ac7de92ee08f02dab8c7242bb5dc181c4bd05366e41db5b1b0fdb3' 
  AND token = '1SupcwJg0NkOLy2Xsdc5qRKadnNGw19iNfAR/GwBFgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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