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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ca718ead0ab7d666bc936411512c205937815522c69fcee19a24102985c1d76' 
  AND token = '6HDp74FX1KoQSfRdT+UD8g11P+YKcbO60UgFnpHi8io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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