SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1fc7b1ebfcfc069281c8ad6b869f6bb04bb50e51e6a9322cd76b66f0db7b5799' 
  AND token = 'Ma/jsA1AF+VmMUn/GQ32gChBlTKFh0PCh7xCc8iimWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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