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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d224bce72bff075fab8b23eb7110cc506734c3f70d39b2c1ed7d2be919b65b1' 
  AND token = 'eEh0zlyHW70vLuny6EsKSmRq3TZ4QTPWTckVckZRmbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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