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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d5f7b3dc7fcef45b1f7e8e2fc6f01bd6c545669c450578cc1c31e57b5d6c881' 
  AND token = 'gmcr9Fgnf5x2HCTdfXN/jEo47KVpyxQ+m+EyKdnzSTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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