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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abadb3951734d0cf43f56eb2e9782518bc83dcc0ec523c64c6f867b30299ae18' 
  AND token = '25QXI7Ria7cHo6WdGlw690xm7aLqCIf9p3uIrqoky0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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