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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2769ae1fab4e3c079d00327827605cc2cd227434efb389b9e44d5f990020be28' 
  AND token = 'x7WsHGqyo9ghAeDEOMZ4+0gOd1Gh16k5DWx+bA69qnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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