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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00538272496bef8742d4d1a72b40629b2f574920b047040efb9712766607c2c4' 
  AND token = 'FqKnDrVASlQzryw532AmuRv2O73KO1Ko9bieVFK0F4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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